ifeq ($(findstring CactusPUGH/PUGH,$(THORNS)),)
.pseudo: MissingPUGHinIsoSurfacer
MissingPUGHinIsoSurfacer:
	@echo "IsoSurfacer: requires PUGH"
	@echo "IsoSurfacer: Please add CactusPUGH/PUGH or remove IsoSurfacer from Thornlist !"
	exit 2
endif